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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating revenues: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | $ 1,264,574 |  | $ 1,131,626 |  | $ 1,343,714 |
Exploration and production, construction materials and contracting, construction services and other | 3,197,830 |  | 2,943,805 |  | 2,706,778 |
Total operating revenues | 4,462,404 |  | 4,075,431 |  | 4,050,492 |
Operating expenses: |  |  |  |  |  |
Fuel and purchased power | 83,528 |  | 72,380 |  | 64,485 |
Purchased natural gas sold | 505,065 |  | 425,220 |  | 572,187 |
Operation and maintenance: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | 269,825 |  | 254,194 |  | 275,866 |
Exploration and production, construction materials and contracting, construction services and other | 2,535,872 |  | 2,377,285 |  | 2,215,269 |
Depreciation, depletion and amortization | 386,856 |  | 359,205 |  | 343,395 |
Taxes, other than income | 188,359 |  | 176,140 |  | 172,923 |
Write-downs of oil and natural gas properties (Note 1) | 0 |  | 391,800 |  | 0 |
Total operating expenses | 3,969,505 |  | 4,056,224 |  | 3,644,125 |
Operating income | 492,899 |  | 19,207 |  | 406,367 |
Earnings (loss) from equity method investments | (132) |  | 5,383 |  | 4,693 |
Other income | 6,768 |  | 6,642 |  | 6,520 |
Interest expense | 83,917 |  | 76,699 |  | 81,354 |
Income (loss) before income taxes | 415,618 |  | (45,467) |  | 336,226 |
Income taxes | 136,736 |  | (31,146) |  | 110,274 |
Income (loss) from continuing operations | 278,882 |  | (14,321) |  | 225,952 |
Income (loss) from discontinued operations, net of tax (Note 3) | (312) | [1] | 13,567 | [1] | (12,926) | [1]
Net income (loss) | 278,570 |  | (754) |  | 213,026 |
Net loss attributable to noncontrolling interest | (363) |  | 0 |  | 0 |
Dividends declared on preferred stocks | 685 |  | 685 |  | 685 |
Earnings (loss) on common stock | $ 278,248 |  | $ (1,439) |  | $ 212,341 |
Earnings (loss) per common share - basic: |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ 1.47 |  | $ (0.08) |  | $ 1.19 |
Discontinued operations, net of tax | $ 0.00 |  | $ 0.07 |  | $ (0.07) |
Earnings (loss) per common share - basic | $ 1.47 |  | $ (0.01) |  | $ 1.12 |
Earnings (loss) per common share - diluted: |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ 1.47 |  | $ (0.08) |  | $ 1.19 |
Discontinued operations, net of tax | $ 0.00 |  | $ 0.07 |  | $ (0.07) |
Earnings (loss) per common share - diluted | $ 1.47 |  | $ (0.01) |  | $ 1.12 |
Weighted average common shares outstanding - basic | 188,855 |  | 188,826 |  | 188,763 |
Weighted average common shares outstanding - diluted | 189,693 |  | 188,826 |  | 188,905 |
[1] | Reflected in the Other category.

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